Ranojoy Bose | HP Labs (original) (raw)

Papers by Ranojoy Bose

We use a fiber-taper waveguide to measure the transmission, photoluminescence, photo-darkening, a... more We use a fiber-taper waveguide to measure the transmission, photoluminescence, photo-darkening, and lifetime from a low density of near-infrared PbS quantum dots integrated with silicon photonic crystal cavities, microdisks, and the taper itself.

PbS quantum dots are promising active emitters for use with high-quality Si nanophotonic devices ... more PbS quantum dots are promising active emitters for use with high-quality Si nanophotonic devices in the telecommunications-band. Measurements of low quantum dot densities are limited both because of low fluorescence levels and the challenges of single photon detection at these wavelengths. Here, we report on methods using a fiber taper waveguide to efficiently extract PbS quantum dot photoluminescence. Temperature dependent

Advances in Photonics of Quantum Computing, Memory, and Communication VIII, 2015

We study the interaction of silicon photonic crystal nanocavities with infiltrated colloidal PbS ... more We study the interaction of silicon photonic crystal nanocavities with infiltrated colloidal PbS nanocrystals as a viable and efficient source for achieving indistinguishable and single photons. Nanocrystal-nanocavity coupling is predicted at near-infrared wavelengths, suggesting the possibility towards exciting silicon-based nanophotonic lasers, and novel efficient sources for fiber and silicon-based quantum information networks and systems. Two effective designs for nanocrystal-nanocavity coupling

Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series, 2008

ABSTRACT We show that integrating waveguides in photonic crystals with cavities coupled to quantu... more ABSTRACT We show that integrating waveguides in photonic crystals with cavities coupled to quantum dots leads to highly efficient nonlinear effects at low photon numbers.

ABSTRACT We describe our work on engineering nonlinear optical devices using quantum dots coupled... more ABSTRACT We describe our work on engineering nonlinear optical devices using quantum dots coupled to optical resonators. These systems enable large optical Stark shifts and all optical switching with low photon numbers.

We present a method to control the resonant coupling interaction in a coupled-cavity photonic cry... more We present a method to control the resonant coupling interaction in a coupled-cavity photonic crystal molecule by using a local and reversible photochromic tuning technique. We demonstrate the ability to tune both a two-cavity and a three-cavity photonic crystal molecule

Conference on Lasers and Electro-Optics/International Quantum Electronics Conference, 2009

Nature Photonics, 2014

ABSTRACT When an atom strongly couples to a cavity, it can undergo coherent vacuum Rabi oscillati... more ABSTRACT When an atom strongly couples to a cavity, it can undergo coherent vacuum Rabi oscillations. Controlling these oscillatory dynamics quickly relative to the vacuum Rabi frequency enables remarkable capabilities such as Fock state generation and deterministic synthesis of quantum states of light, as demonstrated using microwave frequency devices. At optical frequencies, however, dynamical control of single-atom vacuum Rabi oscillations remains challenging. Here, we demonstrate coherent transfer of optical frequency excitation between a single quantum dot and a cavity by controlling vacuum Rabi oscillations. We utilize a photonic molecule to simultaneously attain strong coupling and a cavity-enhanced AC Stark shift. The Stark shift modulates the detuning between the two systems on picosecond timescales, faster than the vacuum Rabi frequency. We demonstrate the ability to add and remove excitation from the cavity, and perform coherent control of light-matter states. These results enable ultra-fast control of atom-cavity interactions in a nanophotonic device platform.

Conference on Lasers and Electro-Optics 2010, 2010

ABSTRACT We use a fiber-taper waveguide to measure the transmission, photoluminescence, photo-dar... more ABSTRACT We use a fiber-taper waveguide to measure the transmission, photoluminescence, photo-darkening, and lifetime from a low density of near-infrared PbS quantum dots integrated with silicon photonic crystal cavities, microdisks, and the taper itself.

2007 Quantum Electronics and Laser Science Conference, 2007

We demonstrate weak coupling interactions of silicon photonic crystals with PbS nanocrystals at r... more We demonstrate weak coupling interactions of silicon photonic crystals with PbS nanocrystals at room temperature. Coupling is verified through cold-cavity integrated waveguide measurements, with polarization extinction of 1.7 and emission enhancements that match simulations.

CLEO: 2014, 2014

ABSTRACT We demonstrate a method to control the coupling interaction in a coupled-cavity photonic... more ABSTRACT We demonstrate a method to control the coupling interaction in a coupled-cavity photonic crystal molecule by using a local and reversible photochromic tuning technique. This method is promising for development of integrated photonic devices with large number of cavities.

Conference on Lasers and Electro-Optics 2012, 2012

ABSTRACT We experimentally realize a photonic crystal microcavity-quantum dot system where a quan... more ABSTRACT We experimentally realize a photonic crystal microcavity-quantum dot system where a quantum dot is simultaneously coupled to evanescently coupled optical cavities with modes spectrally separated by 2.4 nm.

2011 International Semiconductor Device Research Symposium (ISDRS), 2011

We show that integrating waveguides in photonic crystal cavities coupled to quantum dots leads to... more We show that integrating waveguides in photonic crystal cavities coupled to quantum dots leads to highly efficient optical nonlinear effects at low photon numbers. Semiconductor quantum dots coupled to photonic crystal cavities provide a platform where large optical nonlinearities can be observed near the single photon level [1,2]. Coupling photonic crystal cavities to a waveguide allows for efficient routing of

CLEO:2011 - Laser Applications to Photonic Applications, 2011

We investigate strong coupling between a single quantum dot (QD) and photonic crystal cavity thro... more We investigate strong coupling between a single quantum dot (QD) and photonic crystal cavity through transmission modification of an evanescently coupled waveguide. Strong coupling is observed through modification of both the cavity scattering spectrum and waveguide transmission. We achieve an overall Q of 5800 and an exciton-photon coupling strength of 21 GHz for this integrated cavity-waveguide structure. The transmission contrast for the bare cavity mode is measured to be 24%. These results represent important progress towards integrated cavity quantum electrodynamics using a planar photonic architecture.

Optics Express, 2011

We demonstrate a reversibly tunable photonic crystal quantum dot laser using a photochromic thin ... more We demonstrate a reversibly tunable photonic crystal quantum dot laser using a photochromic thin film. The laser is composed of a photonic crystal cavity with a bare cavity Q as high as 4500 coupled to a high density ensemble of indium arsenide quantum dots. By depositing a thin layer of photochromic material on the photonic crystal cavities, the laser can be optically tuned smoothly and reversibly over a wavelength range of 2.68 nm. Lasing is observed at temperatures as high as 80 K in the 900-1000 nm near-infrared wavelength range. The spontaneous emission coupling factor is measured to be as high as β = 0.41, indicating that the laser operates in the high-β regime.

CLEO:2011 - Laser Applications to Photonic Applications, 2011

... (e) Numerical simulation derived from solution to full Master equation showing excellent agre... more ... (e) Numerical simulation derived from solution to full Master equation showing excellent agreement with experiment. Panel c shows the emission spectrum when the cavity is resonantly pumped by a narrowband external cavity diode laser. ...

Physical Review Letters, 2012

We demonstrate fast nonlinear optical switching between two laser pulses with as few as 140 photo... more We demonstrate fast nonlinear optical switching between two laser pulses with as few as 140 photons of pulse energy by utilizing strong coupling between a single quantum dot (QD) and a photonic crystal cavity. The cavity-QD coupling is modified by a detuned pump pulse, resulting in a modulation of the scattered and transmitted amplitude of a time synchronized probe pulse that is resonant with the QD. The temporal switching response is measured to be as fast as 120 ps, demonstrating the ability to perform optical switching on picosecond timescales.

Photonics and Nanostructures - Fundamentals and Applications, 2009

We propose a scheme to realize controlled phase-flip gate between two single photons through a si... more We propose a scheme to realize controlled phase-flip gate between two single photons through a single quantum dot (QD) in a slow-light photonic crystal (PhC) waveguide. Enhanced Purcell factor and large β-factor lead to high gate fidelity over broadband frequencies compared to cavity-assisted system. The excellent physical integration of this PhC waveguide system provides tremendous potential for large-scale quantum information

We use a fiber-taper waveguide to measure the transmission, photoluminescence, photo-darkening, a... more We use a fiber-taper waveguide to measure the transmission, photoluminescence, photo-darkening, and lifetime from a low density of near-infrared PbS quantum dots integrated with silicon photonic crystal cavities, microdisks, and the taper itself.

PbS quantum dots are promising active emitters for use with high-quality Si nanophotonic devices ... more PbS quantum dots are promising active emitters for use with high-quality Si nanophotonic devices in the telecommunications-band. Measurements of low quantum dot densities are limited both because of low fluorescence levels and the challenges of single photon detection at these wavelengths. Here, we report on methods using a fiber taper waveguide to efficiently extract PbS quantum dot photoluminescence. Temperature dependent

Advances in Photonics of Quantum Computing, Memory, and Communication VIII, 2015

We study the interaction of silicon photonic crystal nanocavities with infiltrated colloidal PbS ... more We study the interaction of silicon photonic crystal nanocavities with infiltrated colloidal PbS nanocrystals as a viable and efficient source for achieving indistinguishable and single photons. Nanocrystal-nanocavity coupling is predicted at near-infrared wavelengths, suggesting the possibility towards exciting silicon-based nanophotonic lasers, and novel efficient sources for fiber and silicon-based quantum information networks and systems. Two effective designs for nanocrystal-nanocavity coupling

Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series, 2008

ABSTRACT We show that integrating waveguides in photonic crystals with cavities coupled to quantu... more ABSTRACT We show that integrating waveguides in photonic crystals with cavities coupled to quantum dots leads to highly efficient nonlinear effects at low photon numbers.

ABSTRACT We describe our work on engineering nonlinear optical devices using quantum dots coupled... more ABSTRACT We describe our work on engineering nonlinear optical devices using quantum dots coupled to optical resonators. These systems enable large optical Stark shifts and all optical switching with low photon numbers.

We present a method to control the resonant coupling interaction in a coupled-cavity photonic cry... more We present a method to control the resonant coupling interaction in a coupled-cavity photonic crystal molecule by using a local and reversible photochromic tuning technique. We demonstrate the ability to tune both a two-cavity and a three-cavity photonic crystal molecule

Conference on Lasers and Electro-Optics/International Quantum Electronics Conference, 2009

Nature Photonics, 2014

ABSTRACT When an atom strongly couples to a cavity, it can undergo coherent vacuum Rabi oscillati... more ABSTRACT When an atom strongly couples to a cavity, it can undergo coherent vacuum Rabi oscillations. Controlling these oscillatory dynamics quickly relative to the vacuum Rabi frequency enables remarkable capabilities such as Fock state generation and deterministic synthesis of quantum states of light, as demonstrated using microwave frequency devices. At optical frequencies, however, dynamical control of single-atom vacuum Rabi oscillations remains challenging. Here, we demonstrate coherent transfer of optical frequency excitation between a single quantum dot and a cavity by controlling vacuum Rabi oscillations. We utilize a photonic molecule to simultaneously attain strong coupling and a cavity-enhanced AC Stark shift. The Stark shift modulates the detuning between the two systems on picosecond timescales, faster than the vacuum Rabi frequency. We demonstrate the ability to add and remove excitation from the cavity, and perform coherent control of light-matter states. These results enable ultra-fast control of atom-cavity interactions in a nanophotonic device platform.

Conference on Lasers and Electro-Optics 2010, 2010

ABSTRACT We use a fiber-taper waveguide to measure the transmission, photoluminescence, photo-dar... more ABSTRACT We use a fiber-taper waveguide to measure the transmission, photoluminescence, photo-darkening, and lifetime from a low density of near-infrared PbS quantum dots integrated with silicon photonic crystal cavities, microdisks, and the taper itself.

2007 Quantum Electronics and Laser Science Conference, 2007

We demonstrate weak coupling interactions of silicon photonic crystals with PbS nanocrystals at r... more We demonstrate weak coupling interactions of silicon photonic crystals with PbS nanocrystals at room temperature. Coupling is verified through cold-cavity integrated waveguide measurements, with polarization extinction of 1.7 and emission enhancements that match simulations.

CLEO: 2014, 2014

ABSTRACT We demonstrate a method to control the coupling interaction in a coupled-cavity photonic... more ABSTRACT We demonstrate a method to control the coupling interaction in a coupled-cavity photonic crystal molecule by using a local and reversible photochromic tuning technique. This method is promising for development of integrated photonic devices with large number of cavities.

Conference on Lasers and Electro-Optics 2012, 2012

ABSTRACT We experimentally realize a photonic crystal microcavity-quantum dot system where a quan... more ABSTRACT We experimentally realize a photonic crystal microcavity-quantum dot system where a quantum dot is simultaneously coupled to evanescently coupled optical cavities with modes spectrally separated by 2.4 nm.

2011 International Semiconductor Device Research Symposium (ISDRS), 2011

We show that integrating waveguides in photonic crystal cavities coupled to quantum dots leads to... more We show that integrating waveguides in photonic crystal cavities coupled to quantum dots leads to highly efficient optical nonlinear effects at low photon numbers. Semiconductor quantum dots coupled to photonic crystal cavities provide a platform where large optical nonlinearities can be observed near the single photon level [1,2]. Coupling photonic crystal cavities to a waveguide allows for efficient routing of

CLEO:2011 - Laser Applications to Photonic Applications, 2011

We investigate strong coupling between a single quantum dot (QD) and photonic crystal cavity thro... more We investigate strong coupling between a single quantum dot (QD) and photonic crystal cavity through transmission modification of an evanescently coupled waveguide. Strong coupling is observed through modification of both the cavity scattering spectrum and waveguide transmission. We achieve an overall Q of 5800 and an exciton-photon coupling strength of 21 GHz for this integrated cavity-waveguide structure. The transmission contrast for the bare cavity mode is measured to be 24%. These results represent important progress towards integrated cavity quantum electrodynamics using a planar photonic architecture.

Optics Express, 2011

We demonstrate a reversibly tunable photonic crystal quantum dot laser using a photochromic thin ... more We demonstrate a reversibly tunable photonic crystal quantum dot laser using a photochromic thin film. The laser is composed of a photonic crystal cavity with a bare cavity Q as high as 4500 coupled to a high density ensemble of indium arsenide quantum dots. By depositing a thin layer of photochromic material on the photonic crystal cavities, the laser can be optically tuned smoothly and reversibly over a wavelength range of 2.68 nm. Lasing is observed at temperatures as high as 80 K in the 900-1000 nm near-infrared wavelength range. The spontaneous emission coupling factor is measured to be as high as β = 0.41, indicating that the laser operates in the high-β regime.

CLEO:2011 - Laser Applications to Photonic Applications, 2011

... (e) Numerical simulation derived from solution to full Master equation showing excellent agre... more ... (e) Numerical simulation derived from solution to full Master equation showing excellent agreement with experiment. Panel c shows the emission spectrum when the cavity is resonantly pumped by a narrowband external cavity diode laser. ...

Physical Review Letters, 2012

We demonstrate fast nonlinear optical switching between two laser pulses with as few as 140 photo... more We demonstrate fast nonlinear optical switching between two laser pulses with as few as 140 photons of pulse energy by utilizing strong coupling between a single quantum dot (QD) and a photonic crystal cavity. The cavity-QD coupling is modified by a detuned pump pulse, resulting in a modulation of the scattered and transmitted amplitude of a time synchronized probe pulse that is resonant with the QD. The temporal switching response is measured to be as fast as 120 ps, demonstrating the ability to perform optical switching on picosecond timescales.

Photonics and Nanostructures - Fundamentals and Applications, 2009

We propose a scheme to realize controlled phase-flip gate between two single photons through a si... more We propose a scheme to realize controlled phase-flip gate between two single photons through a single quantum dot (QD) in a slow-light photonic crystal (PhC) waveguide. Enhanced Purcell factor and large β-factor lead to high gate fidelity over broadband frequencies compared to cavity-assisted system. The excellent physical integration of this PhC waveguide system provides tremendous potential for large-scale quantum information