---
res:
  bibo_abstract:
  - Nonlinear optics has become the workhorse for countless applications in classical
    and quantum optics, from optical bistability to single photon pair generation.
    However, the intrinsic weakness of optical nonlinearity and reciprocity of nonlinear
    interactions generally places stringent limits on the efficiency of nonlinear
    optical processes and their ability to be tailored for advanced applications in
    multimode systems. Here, motivated by recent advances in using non-Hermitian photonics
    and gain/loss engineering to enable non-reciprocal light transport, we explore
    how the interplay between non-Hermiticity and optical nonlinearity leads to a
    fundamentally new regime of nonlinear frequency conversion. We show how non-Hermitian
    coupling between discrete frequency modes can result in non-reciprocal flow of
    energy in a frequency dimension, closely resembling the non-Hermitian skin effect
    (NHSE). Applying our theory to a multimode nonlinear cavity supporting cascaded
    nonlinear processes, we demonstrate chiral energy flow in a frequency dimension,
    leading to long-range frequency shifts of quasi-continuous wave sources, shaped
    frequency combs robust to defects and disorder, terahertz (THz) generation far
    exceeding the Manley-Rowe limit, and nonlinear multimodal limit cycles for multi-frequency
    pump-probe spectroscopy.@eng
  bibo_authorlist:
  - foaf_Person:
      foaf_givenName: Sahil
      foaf_name: Pontula, Sahil
      foaf_surname: Pontula
  - foaf_Person:
      foaf_givenName: Sachin
      foaf_name: Vaidya, Sachin
      foaf_surname: Vaidya
  - foaf_Person:
      foaf_givenName: Charles
      foaf_name: Roques-Carmes, Charles
      foaf_surname: Roques-Carmes
      foaf_workInfoHomepage: http://www.librecat.org/personId=e2e68fc9-6505-11ef-a541-eb4e72cc3e82
  - foaf_Person:
      foaf_givenName: Shiekh Zia
      foaf_name: Uddin, Shiekh Zia
      foaf_surname: Uddin
  - foaf_Person:
      foaf_givenName: Marin
      foaf_name: Soljačić, Marin
      foaf_surname: Soljačić
  - foaf_Person:
      foaf_givenName: Yannick
      foaf_name: Salamin, Yannick
      foaf_surname: Salamin
  bibo_doi: 10.1038/s41467-025-62853-0
  bibo_volume: 16
  dct_date: 2025^xs_gYear
  dct_isPartOf:
  - http://id.crossref.org/issn/2041-1723
  dct_language: eng
  dct_publisher: Springer Nature@
  dct_title: Non-reciprocal frequency conversion in a non-Hermitian multimode nonlinear
    system@
  fabio_hasPubmedId: '40813767'
...